Wrong OS or OS version for application

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You have downloaded and installed ‘Timesheet add-in‘ successfully on your system. However, when you start Outlook, you may get the following error:

In Outlook version: 15
At Line: 4
In Function: Helper.StartRedemption
Exception Number: -2147220998
Exception Description: Wrong OS or OS version for application (Exception from HRESULT: 0x800401FA (CO_E_WRONGOSFORAPP))
OS:6.2.9200.0 (Win32NT)
Module Version: Version

The error happens if you have installed the wrong setup of add-in on your system. For instance, if you have 32 bit Outlook on a 64 bit Windows, you might had downloaded and installed the 64 bit add-in setup in trying to match the bit-ness of your Windows OS. However, the Widnows OS bit has no play here. We have provided 32 bit and 64 bit setups of the add-in because your Microsoft Office/Outlook can be either 32 bit or 64 bit. You should match the bit-ness of the Office/Outlook and not the Windows OS.

For example, If your Outlook is 32 bit, you should download the x86 setups. (and x64 setups if your Outlook is 64 bit). It does not matter if your Windows OS is 32 bit or 64 bit. 

Outlook 2010 to 2019 can be 32 bit or 64 bit on a 64 bit OS. So, if your OS is 64 bit, but Outlook is 32 bit, you should download and install the x86 setup.

After you have downloaded the correct setup type, shutdown Outlook, and uninstall the wrong ‘add-in’ from your system (via Control Panel > Programs and Features) and then run the setup.exe to re-install the correct one.

If you are not quite sure if your Outlook is 32 bit or 64 bit, refer to this KB article to find out more

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